JPH10282940A - Tft-lcd driving circuit and driving method thereof - Google Patents
Tft-lcd driving circuit and driving method thereofInfo
- Publication number
- JPH10282940A JPH10282940A JP10094368A JP9436898A JPH10282940A JP H10282940 A JPH10282940 A JP H10282940A JP 10094368 A JP10094368 A JP 10094368A JP 9436898 A JP9436898 A JP 9436898A JP H10282940 A JPH10282940 A JP H10282940A
- Authority
- JP
- Japan
- Prior art keywords
- tft
- driving circuit
- lcd
- data
- data line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0248—Precharge or discharge of column electrodes before or after applying exact column voltages
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
- G09G2330/023—Power management, e.g. power saving using energy recovery or conservation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、薄膜トランジスタ
液晶表示装置(TFT−LCD:Thin Film Transist
or Liquid Crystal Display:以下、TFT−LCDと称
す)の駆動回路及び駆動方法に係るもので、詳しくは、
ドットインバージョン(Dot Inversion)及びコラムイン
バージョン(Column Inversion)方式を用いて電力消耗
を低減し、液晶及びTFTの特性劣化を防止し得るTF
T−LCD駆動回路及び駆動方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film transistor liquid crystal display (TFT-LCD).
or Liquid Crystal Display: hereafter referred to as TFT-LCD) driving circuit and driving method.
TF capable of reducing power consumption and preventing deterioration of characteristics of liquid crystal and TFT by using a dot inversion (Dot Inversion) method and a column inversion method.
The present invention relates to a T-LCD drive circuit and a drive method.
【0002】[0002]
【従来の技術】従来のTFT−LCD駆動回路は、図5
に示したように、複数のゲートラインGLと複数のデー
タラインDLとの各交叉点に配置された複数の画素5を
有する液晶パネル10と、該液晶パネル10のデータラ
インDLを介して各画素5に映像信号を供給するデータ
駆動部20と、液晶パネル10の1個のゲートラインG
Lを選択し、そのゲートラインGLに接続されている複
数の画素5をオンさせるゲート駆動部30と、を備えて
構成されていた。2. Description of the Related Art A conventional TFT-LCD driving circuit is shown in FIG.
As shown in FIG. 5, a liquid crystal panel 10 having a plurality of pixels 5 arranged at respective intersections of a plurality of gate lines GL and a plurality of data lines DL, and each pixel via a data line DL of the liquid crystal panel 10 And a gate line G of the liquid crystal panel 10 for supplying a video signal to the liquid crystal panel 10.
And a gate drive unit 30 for selecting L and turning on the plurality of pixels 5 connected to the gate line GL.
【0003】そして、各画素5は、ゲートがゲートライ
ンGLと接続され、ドレインがデータラインDLと接続
された複数の薄膜トランジスタ1と、該薄膜トランジス
タ1のソースにそれぞれ並列に接続された貯蔵キャパシ
タCs及び液晶キャパシタClcとを備えていた。以
下、このように構成された従来のTFT−LCD駆動回
路の動作を説明する。Each pixel 5 has a plurality of thin film transistors 1 each having a gate connected to the gate line GL and a drain connected to the data line DL, and a storage capacitor Cs connected in parallel to the source of the thin film transistor 1. And a liquid crystal capacitor Clc. Hereinafter, the operation of the conventional TFT-LCD driving circuit thus configured will be described.
【0004】先ず、データ駆動部20のシフトトランジ
スタ(図示されず)は、映像データを一つの画素毎に順
次受けて各データラインDLに該当する映像データとし
て貯蔵する。次いで、ゲート駆動部30は、ゲートライ
ン選択信号GLSを出力して複数のゲートラインGL
中、一つのゲートラインGLを順次選択する。これによ
って、選択されたゲートラインGLに接続された複数の
薄膜トランジスタ1がそれぞれターンオンし、データ駆
動部20のシフトトランジスタに貯蔵された映像データ
がドレインに印加され、映像データが液晶パネル10に
表示される。その後、このような動作が反復され、映像
データが継続して液晶パネル10に表示される。[0004] First, a shift transistor (not shown) of the data driver 20 sequentially receives video data for each pixel and stores the video data as video data corresponding to each data line DL. Next, the gate driving unit 30 outputs the gate line selection signal GLS to output the plurality of gate lines GL.
Among them, one gate line GL is sequentially selected. Accordingly, the plurality of thin film transistors 1 connected to the selected gate line GL are turned on, and the image data stored in the shift transistor of the data driver 20 is applied to the drain, and the image data is displayed on the liquid crystal panel 10. You. Thereafter, such an operation is repeated, and the video data is continuously displayed on the liquid crystal panel 10.
【0005】このとき、データ駆動部20は、VCO
M、正の映像信号(Positive video signal)及び負の映
像信号(Negative video signal)を液晶パネル10に供
給して映像データを液晶パネル10に表示させる。即
ち、図6に示したように、従来のTFT−LCD駆動回
路は、駆動されるときに、液晶にDC電圧が印加されな
いように、フレームが変換される度毎に、正の映像信号
と負の映像信号とが交互に画素に印加される。これを可
能にするために、TFT−LCDの液晶パネルの電極に
正の映像信号及び負の映像信号の中間電圧であるVCO
Mを印加する。[0005] At this time, the data driving unit 20 outputs the VCO
M, a positive video signal (Positive video signal) and a negative video signal (Negative video signal) are supplied to the liquid crystal panel 10 to display the video data on the liquid crystal panel 10. That is, as shown in FIG. 6, the conventional TFT-LCD driving circuit is configured such that a positive video signal and a negative video signal are output each time a frame is converted so that no DC voltage is applied to the liquid crystal when driven. Are alternately applied to the pixels. In order to make this possible, VCO which is an intermediate voltage between a positive video signal and a negative video signal is applied to the electrode of the liquid crystal panel of the TFT-LCD.
M is applied.
【0006】ところが、VCOMを基準とし、液晶パネ
ルに正の映像信号と負の映像信号とを交互に印加する
と、液晶の光伝達曲線が一致しなくなってフリッカー効
果(Flicker effect)が発生する。そこで、このような
フリッカー効果の発生を低減するため、図7〜10にそ
れぞれ示したようなフレームインバージョン(Frame In
version)、ラインインバージョン(Line Inversion)、
コラムインバージョン(Column Inversion)及びドット
インバージョン(Dot Inversion)のような四つの方式が
用いられる。However, if a positive video signal and a negative video signal are alternately applied to the liquid crystal panel based on VCOM, the light transmission curves of the liquid crystal become inconsistent and a flicker effect occurs. Therefore, in order to reduce the occurrence of such a flicker effect, a frame inversion (Frame Inversion) as shown in FIGS.
version), Line Inversion,
Four methods such as Column Inversion and Dot Inversion are used.
【0007】即ち、図7は、フレームインバージョン方
式を用いるTFT−LCD駆動方法において、フレーム
が変換するときのみ映像信号の極性が変化することを示
している。図8は、ラインインバージョン方式を用いる
TFT−LCD駆動方法において、ゲートラインGLが
変換する度毎に極性が変化することを示している。図9
は、コラムインバージョン方式を用いるTFT−LCD
駆動方法において、データラインDLが変換する度及び
フレームが変換する度毎に映像信号の極性が変化するこ
とを示し、図10は、ドットインバージョン方式を用い
るTFT−LCD駆動方法において、各データラインD
LのゲートラインGLが変換する度及びフレームが変換
する度毎に映像信号の極性が変化することを示してい
る。尚、図7〜図10において、+は正の映像信号、−
は負の映像信号を示す。That is, FIG. 7 shows that the polarity of the video signal changes only when the frame is converted in the TFT-LCD driving method using the frame inversion method. FIG. 8 shows that in the TFT-LCD driving method using the line inversion method, the polarity changes every time the gate line GL is converted. FIG.
Is a TFT-LCD using the column inversion method
In the driving method, the polarity of the video signal changes every time the data line DL is converted and each time the frame is converted. FIG. 10 shows each data line in the TFT-LCD driving method using the dot inversion method. D
This shows that the polarity of the video signal changes each time the L gate line GL is converted and each time the frame is converted. 7 to 10, + represents a positive video signal, and − represents a positive video signal.
Indicates a negative video signal.
【0008】[0008]
【発明が解決しようとする課題】このとき、画質は、フ
レームインバージョン、ラインインバージョン、コラム
インバージョン及びドットインバージョン方式の順に良
好であるが、該画質に比例して極性が変化する確率が増
加するため、それに伴って、電力消費量も増加する。At this time, the image quality is good in the order of frame inversion, line inversion, column inversion and dot inversion, but the probability that the polarity changes in proportion to the image quality is high. As a result, power consumption increases accordingly.
【0009】この点を図11に示したドットインバージ
ョンを例として説明すると、次のようである。即ち、図
11は、ドットインバージョン時の液晶パネル10に入
力する奇数番目のデータラインDL及び偶数番目のデー
タラインDLの各信号波形図で、図示したように、ゲー
トラインGLが変換される度毎に、映像信号VCOMを
基準としたときのデータラインDLの極性が変化する。This point will be described below with reference to the dot inversion shown in FIG. 11 as an example. That is, FIG. 11 is a signal waveform diagram of the odd-numbered data lines DL and the even-numbered data lines DL input to the liquid crystal panel 10 at the time of dot inversion, and as shown in the drawing, every time the gate line GL is converted. Each time, the polarity of the data line DL with respect to the video signal VCOM changes.
【0010】このとき、TFT−LCDパネルが全体と
して一様なグレー(Gray)を表現していると仮定する
と、データラインDLの映像信号変化幅Vは、VCOM
と正の映像信号との変化幅又はVCOMと負の映像信号
との変化幅の2倍になるため、データラインDLのキャ
パシタンスをCL として、出力端における電力消費量P
1を算出すると、次のような式になる。At this time, assuming that the TFT-LCD panel expresses a uniform gray as a whole, the video signal change width V of the data line DL is VCOM.
DOO positive for twice the range of change in the variation width or VCOM and the negative image signal of the video signal, the capacitance of the data line DL as C L, power consumption P at the output end
When 1 is calculated, the following equation is obtained.
【0011】 P1=VDD・Iave =VDD(CL ・V・Freq GL) ここで、VDDは電力供給電圧、Freq GLはゲートライ
ン周波数である。このように、ドットインバージョン方
式は、ゲートラインGLが変換される度毎に映像信号
が、VCOMを基準として正から負に変化するため、多
くの電力を消耗するという欠点があった。[0011] P1 = VDD · Iave = VDD ( C L · V · Freq GL) where, VDD is the power supply voltage, Freq GL denotes a gate line frequency. As described above, the dot inversion method has a disadvantage that a large amount of power is consumed because the video signal changes from positive to negative with respect to VCOM every time the gate line GL is converted.
【0012】このため、このような従来のTFT−LC
D駆動回路においては、多結晶シリコン薄膜トランジス
タ(Poly-Si TFT)を用いて液晶表示装置を製造する場
合、大量の電力を消耗して熱発生が増加するため、熱に
よる液晶及びTFTの特性劣化(Degradation)を招来す
るという不都合な点があった。そこで、本発明は、この
ような従来のTFT−LCD駆動回路における課題に鑑
みてなされたもので、電力の消耗を低減し得るTFT−
LCD駆動回路及び駆動方法を提供することを目的とす
る。Therefore, such a conventional TFT-LC
In a D drive circuit, when a liquid crystal display device is manufactured using a polycrystalline silicon thin film transistor (Poly-Si TFT), a large amount of power is consumed and heat generation increases. Degradation). Therefore, the present invention has been made in view of such a problem in the conventional TFT-LCD driving circuit, and has been made in consideration of the TFT-LCD driving circuit capable of reducing power consumption.
It is an object to provide an LCD driving circuit and a driving method.
【0013】[0013]
【課題を解決するための手段】このような本発明の目的
を達成するため、請求項1は、映像信号を各画素に複数
のデータラインを介して出力するデータ駆動部と、前記
各データラインを介して供給された映像信号を表示する
液晶パネルと、を備えたTFT−LCD駆動回路におい
て、前記データ駆動部と前記液晶パネルとの間に配置さ
れ、ブランキング時間の間に入力される電荷再活用制御
信号に基づいて、データラインDLに充電された電荷を
再活用可能にする伝送ゲート部を備て構成した。To achieve the object of the present invention, a data driver for outputting a video signal to each pixel via a plurality of data lines; And a liquid crystal panel for displaying a video signal supplied via the TFT-LCD drive circuit, a charge input between the data driver and the liquid crystal panel and input during a blanking time. A transmission gate unit is provided to enable the electric charge charged in the data line DL to be reused based on the reuse control signal.
【0014】本TFT−LCD駆動回路によれば、ブラ
ンキング時間の間、TFT−LCD駆動回路に電荷再活
用制御信号が印加され、隣接するデータラインが相互に
短絡される。その結果、正の映像信号により充電された
データラインの一部の電荷が負の映像信号により充電さ
れたデータラインに移動し、データラインの電荷を有効
に再活用することができる。According to the TFT-LCD drive circuit, during the blanking time, the charge recycling control signal is applied to the TFT-LCD drive circuit, and adjacent data lines are short-circuited to each other. As a result, a part of the charge of the data line charged by the positive video signal moves to the data line charged by the negative video signal, and the charge of the data line can be effectively reused.
【0015】伝送ゲート部は、例えば、請求項2に記載
されているように、奇数番目のデータラインとそれに隣
接する偶数番目のデータラインとの間に接続された複数
の伝送ゲートから構成することができる。伝送ゲート部
を複数の伝送ゲートから構成する場合、各伝送ゲートT
Gは、請求項3に記載されているように、PMOSトラ
ンジスタとNMOSトランジスタを互いに並列に接続し
たものから構成することができる。[0015] The transmission gate section may comprise a plurality of transmission gates connected between the odd-numbered data line and the even-numbered data line adjacent thereto, for example. Can be. When the transmission gate section is composed of a plurality of transmission gates, each transmission gate T
G can be configured by connecting a PMOS transistor and an NMOS transistor in parallel with each other.
【0016】請求項4に記載されているように、伝送ゲ
ート部はパストランジスタ部からなり、該パストランジ
スタ部は、奇数番目のデータラインとそれに隣接する偶
数番目のデータラインとの間に接続された各パストラン
ジスタから構成されるようにすることもできる。請求項
5に記載されているように、電荷再活用制御信号は、ゲ
ートライン又はフレームが変換される度毎に発生するよ
うに設定される。According to a fourth aspect of the present invention, the transmission gate section includes a pass transistor section, and the pass transistor section is connected between an odd-numbered data line and an even-numbered data line adjacent thereto. It is also possible to constitute each pass transistor. As described in claim 5, the charge recycling control signal is set to be generated every time a gate line or a frame is converted.
【0017】或いは、請求項6に記載されているよう
に、電荷再活用制御信号は、ブランキングされる所定時
間の間において発生するように設定することもできる。
請求項7は、ドットインバージョン方式及びコラムイン
バージョン方式のTFT−LCD駆動回路の駆動方法に
おいて、水平ブランキング時間又は垂直ブランキング時
間の間、電荷再活用制御信号を印加して奇数番目のデー
タライン及びそれに隣接する偶数番目のデータラインを
短絡させ、データラインに充電された電荷を再活用する
ことを特徴とする。Alternatively, the charge recycling control signal can be set to be generated during a predetermined blanking time.
8. A driving method of a TFT-LCD driving circuit of a dot inversion method and a column inversion method, wherein a charge recycle control signal is applied during a horizontal blanking time or a vertical blanking time to form odd-numbered data. The line and an even-numbered data line adjacent to the line are short-circuited, and the charge stored in the data line is reused.
【0018】[0018]
【発明の実施の形態】以下、本発明の実施の形態を図面
を用いて説明する。尚、従来と同一部分には同一符号を
付して説明を省略する。本実施形態に係るTFT−LC
D駆動回路は、図1に示したように、従来のTFT−L
CD駆動回路に、電荷再活用制御信号CRにより奇数番
目のデータラインDL及びそれに隣接する偶数番目のデ
ータラインDLを短絡させてデータラインDLに充電さ
れた電荷を再活用させる伝送ゲート部40を加えて構成
されている。Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the related art are denoted by the same reference numerals, and description thereof is omitted. TFT-LC according to the present embodiment
As shown in FIG. 1, the D driving circuit is a conventional TFT-L
The CD drive circuit further includes a transmission gate unit 40 for short-circuiting the odd-numbered data line DL and the even-numbered data line DL adjacent to the odd-numbered data line DL by the charge recycling control signal CR to reuse the charge charged in the data line DL. It is configured.
【0019】伝送ゲート部40は、奇数番目のデータラ
インDLと偶数番目のデータラインDLとの間に接続さ
れた複数の伝送ゲートTGから構成され、各伝送ゲート
TGは、相互に並列に接続したPMOSトランジスタ
(図示せず)及びNMOSトランジスタ(図示せず)か
らなり、電荷再活用制御信号CR及びインバータ41で
反転された電荷再活用制御信号 /CRにより制御され
る。このように、各伝送ゲートTGを二つのMOSトラ
ンジスタだけで構成すれば、各伝送ゲートTGの構造延
いては伝送ゲート部40の構造を単純化することができ
る。The transmission gate section 40 is composed of a plurality of transmission gates TG connected between odd-numbered data lines DL and even-numbered data lines DL, and each transmission gate TG is connected in parallel with each other. It comprises a PMOS transistor (not shown) and an NMOS transistor (not shown), and is controlled by a charge recycling control signal CR and a charge recycling control signal / CR inverted by the inverter 41. As described above, if each transmission gate TG is composed of only two MOS transistors, the structure of each transmission gate TG and the structure of the transmission gate unit 40 can be simplified.
【0020】以下、このように構成された本実施形態に
係るTFT−LCD駆動回路の動作を説明すると次のよ
うである。先ず、データ駆動部20は、各画素に対する
映像データを順次受けて複数のデータラインDLに該当
する映像信号として出力し、ゲート駆動部30は、ゲー
トライン選択信号GLSを出力して複数のゲートライン
GLを一つずつ順次選択する。Hereinafter, the operation of the TFT-LCD drive circuit according to the present embodiment thus configured will be described as follows. First, the data driver 20 sequentially receives video data for each pixel and outputs the video data as a video signal corresponding to a plurality of data lines DL. The gate driver 30 outputs a gate line selection signal GLS to output a plurality of gate lines. GLs are sequentially selected one by one.
【0021】その結果、選択されたゲートラインGLに
接続された薄膜トランジスタがターンオンし、データ駆
動部20から出力された映像信号が奇数番目のデータラ
インDL及び偶数番目のデータラインDLを経て液晶パ
ネル10に表示される。このとき、伝送ゲート部40
は、電荷再活用制御信号CRがオンされると、奇数番目
のデータラインDL及びそれに隣接する偶数番目のデー
タラインDLを短絡させ、正の映像信号により充電され
たデータラインDLの一部の電荷を負の映像信号により
充電されたデータラインDLに移動させて電荷を再活用
可能にする。As a result, the thin film transistor connected to the selected gate line GL is turned on, and the video signal output from the data driver 20 is supplied to the liquid crystal panel 10 via the odd data line DL and the even data line DL. Will be displayed. At this time, the transmission gate unit 40
When the charge recycling control signal CR is turned on, the odd-numbered data line DL and the even-numbered data line DL adjacent thereto are short-circuited, and a part of the data line DL charged by the positive video signal is charged. Is moved to the data line DL charged by the negative video signal to enable the charge to be reused.
【0022】次いで、外部から入力される映像信号は、
フレームとフレーム間及びゲートラインGLとゲートラ
インGL間に、それぞれ映像信号が入力されないブラン
キング時間を有する。ゲートラインGL間のブランキン
グ時間は水平ブランキング時間、フレーム間のブランキ
ング時間は垂直ブランキング時間といい、一般に、水平
ブランキング時間は5.72μsec、垂直ブランキン
グ時間は約10μsecになる。Next, the video signal input from the outside is
There is a blanking time during which a video signal is not input between frames and between the gate lines GL. The blanking time between the gate lines GL is called a horizontal blanking time, and the blanking time between frames is called a vertical blanking time. In general, the horizontal blanking time is 5.72 μsec, and the vertical blanking time is about 10 μsec.
【0023】このブランキング時間の間に、所定パルス
幅を有する電荷再活用制御信号CRを伝送ゲート部40
に印加し、複数の伝送ゲートTGをそれぞれオンさせて
データラインDLに充電されていた電荷を再活用する。
このとき、電荷再活用制御信号CRは、アナログ駆動方
式を用いた場合では、各ゲートラインGLの水平ブラン
キング時間になると、オンになり、ディジタル駆動方式
を用いた場合では、ゲートラインGLがオンされた後、
ディジタル/アナログ変換する直前にラインパルス信号
と共に用いることができるため、アナログ及びディジタ
ル駆動方式に共用することができる。During the blanking time, the charge recycle control signal CR having a predetermined pulse width is transmitted to the transmission gate unit 40.
To turn on a plurality of transmission gates TG, respectively, to reuse the charge charged in the data line DL.
At this time, the charge recycling control signal CR is turned on when the horizontal blanking time of each gate line GL is reached in the case of using the analog drive method, and is turned on in the case of using the digital drive method. After that,
Since it can be used together with a line pulse signal immediately before digital / analog conversion, it can be used for both analog and digital drive systems.
【0024】そして、図2は、ドットインバージョン方
式を用いた場合に、各ゲートラインGL間の水平ブラン
キング時間において電荷を再活用するときの各信号波形
を示した波形図であって、ゲートラインGLがオンされ
た後、奇数番目のデータラインDLとそれに隣接する偶
数番目のデータラインDLとが相互に接続され、外部電
源に関わらず、ともにVCOM程度の電圧になることが
示されている。FIG. 2 is a waveform diagram showing signal waveforms when electric charges are reused during the horizontal blanking time between the gate lines GL when the dot inversion method is used. After the line GL is turned on, the odd-numbered data line DL and the even-numbered data line DL adjacent thereto are connected to each other, and both have a voltage of about VCOM regardless of the external power supply. .
【0025】さらに、図3に示したように、ゲート駆動
部30からゲートライン選択信号(GLS#1 −GLS#N )が
順次入力され、水平ブランキング時間の間、各ゲートラ
イン(GL#1−GL#N)の電荷再活用制御信号CRがオンに
なると、伝送ゲート部40の複数の伝送ゲートTGがそ
れぞれターンオンされる。その結果、奇数番目のデータ
ラインDL及びそれに隣接する偶数番目のデータライン
DL対が短絡され、図2に示したように、両データライ
ンDL間の電圧は、中間レベルのVCOMになって電荷
を再活用し得るようになる。Further, as shown in FIG. 3, gate line selection signals (GLS # 1 to GLS # N) are sequentially input from the gate driver 30, and each gate line (GL # 1) is supplied during the horizontal blanking time. When the charge recycling control signal CR of (−GL # N) is turned on, the plurality of transmission gates TG of the transmission gate unit 40 are turned on. As a result, the odd-numbered data line DL and the adjacent even-numbered data line DL pair are short-circuited, and as shown in FIG. 2, the voltage between the two data lines DL becomes an intermediate level VCOM and charges are accumulated. It can be reused.
【0026】その後、電荷再活用制御信号CRがオフに
なると、奇数番目のデータラインDLとそれに隣接する
偶数番目のデータラインDLとは、相互に分離され、す
なわち、短絡状態が解除され、データ駆動部20から出
力された映像信号は、各データラインDLを経て液晶パ
ネル10にそれぞれ表示される。このように、従来のT
FT−LCD回路においては、外部電源によるデータラ
インDLの映像信号の変化幅はVであったが、本実施形
態においては、図2に示したように、V/2の電荷を再
活用するため、電圧が変化し、このため、外部電源によ
る電圧変化は1/2に減少される。その結果、出力端で
の電力消費量P2は次のように、1/2に減少される。Thereafter, when the charge recycling control signal CR is turned off, the odd-numbered data line DL and the adjacent even-numbered data line DL are separated from each other, that is, the short-circuit state is released, and the data driving is performed. The video signal output from the unit 20 is displayed on the liquid crystal panel 10 via each data line DL. Thus, the conventional T
In the FT-LCD circuit, the change width of the video signal on the data line DL due to the external power supply is V, but in the present embodiment, as shown in FIG. , The voltage changes, and the voltage change by the external power supply is reduced by half. As a result, the power consumption P2 at the output end is reduced by half as follows.
【0027】 P2=VDD[CL ・(1/2)V・Freq GL] =(1/2)VDD[CL ・V・Freq GL] =(1/2)P1 そして、図4は、本実施形態に係るTFT−LCD駆動
回路をコラムインバージョン方式に適用した場合を示し
たものであって、フレーム間の垂直ブランキング時間の
間、電荷再活用制御信号CRを印加して電荷を再活用す
るときの各信号の波形が示されている。且つ、このとき
の動作は、上述のドットインバージョン方式と同様で、
出力端での電力消費量も1/4に減少される。[0027] P2 = VDD [C L · ( 1/2) V · Freq GL] = (1/2) VDD [C L · V · Freq GL] = (1/2) P1 and FIG. 4, the FIG. 9 shows a case where the TFT-LCD driving circuit according to the embodiment is applied to a column inversion method, in which charge is reused by applying a charge recycling control signal CR during a vertical blanking time between frames. The waveforms of the respective signals are shown in FIG. And the operation at this time is the same as the above-mentioned dot inversion method,
The power consumption at the output is also reduced by a factor of four.
【0028】[0028]
【発明の効果】以上説明したように、本発明に係るTF
T−LCD駆動回路によれば、ドットインバージョン方
式及びコラムインバージョン方式に適用する場合、ブラ
ンキング時間の間、TFT−LCD駆動回路に電荷再活
用制御信号CRを印加して奇数番目のデータラインDL
及びそれに隣接する偶数番目のデータラインDLを短絡
させ、データラインDLの電荷を再活用するようになる
ため、出力端の電力消費量を1/4に減少し得るという
効果がある。As described above, the TF according to the present invention
According to the T-LCD drive circuit, when applied to the dot inversion method and the column inversion method, during the blanking time, the charge reuse control signal CR is applied to the TFT-LCD drive circuit and the odd-numbered data lines are applied. DL
In addition, since even-numbered data lines DL adjacent thereto are short-circuited and charges on the data lines DL are reused, the power consumption at the output terminal can be reduced to 1 /.
【0029】且つ、駆動回路の電力消費量の減少に伴い
熱の発生も少なくなるため、多結晶シリコン薄膜トラン
ジスタ(Poly-Si TFT)を用いて液晶表示装置を製造する
場合、熱による液晶及びTFTの特性劣化を低減し得る
という効果がある。又、本発明をアナログ駆動方式に適
用する場合、データラインのアナログスイッチを縮小化
してフィードスルーノイズ(Feedthrough noise)を低減
し得るという効果がある。In addition, since the generation of heat is reduced as the power consumption of the drive circuit is reduced, when a liquid crystal display device is manufactured using a polycrystalline silicon thin film transistor (Poly-Si TFT), the liquid crystal and the TFT due to heat are not heated. There is an effect that characteristic deterioration can be reduced. Further, when the present invention is applied to an analog driving method, there is an effect that analog switches of data lines can be reduced in size to reduce feedthrough noise.
【図1】本発明の一実施形態に係るTFT−LCD駆動
回路のブロック図である。FIG. 1 is a block diagram of a TFT-LCD drive circuit according to an embodiment of the present invention.
【図2】図1のTFT−LCD駆動回路における各駆動
信号の波形図ある。FIG. 2 is a waveform diagram of each drive signal in the TFT-LCD drive circuit of FIG.
【図3】図1に示した実施形態に係るTFT−LCD駆
動回路にドット(Dot)インバージョン方式を適用したと
きの各信号波形図である。3 is a signal waveform diagram when a dot (Dot) inversion method is applied to the TFT-LCD drive circuit according to the embodiment shown in FIG. 1;
【図4】本発明に係るTFT−LCD駆動回路にコラム
(Column)インバージョン方式を適用したときの各信号
波形図である。FIG. 4 is a diagram showing signal waveforms when a column inversion method is applied to a TFT-LCD drive circuit according to the present invention.
【図5】従来のTFT−LCD駆動回路のブロック図で
ある。FIG. 5 is a block diagram of a conventional TFT-LCD drive circuit.
【図6】図5に示した従来のTFT−LCD駆動回路に
おける各駆動信号の波形図である。6 is a waveform diagram of each drive signal in the conventional TFT-LCD drive circuit shown in FIG.
【図7】従来のTFT−LCD駆動回路にフレームイン
バージョン方式を適用したときの説明図である。FIG. 7 is an explanatory diagram when a frame inversion method is applied to a conventional TFT-LCD drive circuit.
【図8】従来のTFT−LCD駆動回路にラインインバ
ージョン方式を適用したときの説明図である。FIG. 8 is an explanatory diagram when a line inversion method is applied to a conventional TFT-LCD drive circuit.
【図9】従来のTFT−LCD駆動回路にコラムインバ
ージョン方式を適用したときの説明図である。FIG. 9 is an explanatory diagram when a column inversion method is applied to a conventional TFT-LCD drive circuit.
【図10】従来のTFT−LCD駆動回路にドットイン
バージョン方式を適用したときの説明図である。FIG. 10 is an explanatory diagram when a dot inversion method is applied to a conventional TFT-LCD drive circuit.
【図11】一般のドット(Dot)インバージョン方式の各
信号波形図である。FIG. 11 is a signal waveform diagram of a general dot (Dot) inversion method.
5:画素 10:液晶パネル 20:データ駆動部 30:ゲート駆動部 40:伝送ゲート部 5: Pixel 10: Liquid crystal panel 20: Data driver 30: Gate driver 40: Transmission gate unit
Claims (7)
ンを介して出力するデータ駆動部と、前記各データライ
ンを介して供給された映像信号を表示する液晶パネル
と、を備えたTFT−LCD駆動回路において、 前記データ駆動部と前記液晶パネルとの間に配置され、
ブランキング時間の間に入力される電荷再活用制御信号
に基づいて、前記データラインに充電された電荷を再活
用する伝送ゲート部を備えて構成されることを特徴とす
るTFT−LCD駆動回路。1. A TFT-LCD comprising: a data driver for outputting video data to each pixel via a plurality of data lines; and a liquid crystal panel for displaying a video signal supplied via each of the data lines. In the driving circuit, disposed between the data driving unit and the liquid crystal panel,
A TFT-LCD driving circuit, comprising: a transmission gate unit for reusing a charge charged in the data line based on a charge recycle control signal input during a blanking time.
ラインとそれに隣接する偶数番目のデータラインとの間
に接続された複数の伝送ゲートを備えて構成されること
を特徴とする請求項1記載のTFT−LCD駆動回路。2. The transmission gate unit according to claim 1, wherein the transmission gate unit includes a plurality of transmission gates connected between the odd-numbered data line and the even-numbered data line adjacent thereto. The TFT-LCD drive circuit as described in the above.
スタとNMOSトランジスタを互いに並列に接続したも
のであることを特徴とする請求項2記載のTFT−LC
D駆動回路。3. The TFT-LC according to claim 2, wherein each transmission gate comprises a PMOS transistor and an NMOS transistor connected in parallel with each other.
D drive circuit.
部からなり、該パストランジスタ部は、奇数番目のデー
タラインとそれに隣接する偶数番目のデータラインとの
間に接続された各パストランジスタを備えて構成される
ことを特徴とする請求項2記載のTFT−LCD駆動回
路。4. The transmission gate unit includes a pass transistor unit, and the pass transistor unit includes pass transistors connected between odd-numbered data lines and adjacent even-numbered data lines. The TFT-LCD driving circuit according to claim 2, wherein the driving circuit is configured.
ライン又はフレームが変換される度毎に発生することを
特徴とする請求項1記載のTFT−LCD駆動回路。5. The TFT-LCD driving circuit according to claim 1, wherein the charge recycling control signal is generated every time the gate line or the frame is converted.
グされる所定時間の間において発生することを特徴とす
る請求項1記載のTFT−LCD駆動回路。6. The TFT-LCD driving circuit according to claim 1, wherein the charge recycle control signal is generated during a predetermined blanking time.
ンバージョン方式のTFT−LCD駆動回路の駆動方法
において、水平ブランキング時間又は垂直ブランキング
時間の間、電荷再活用制御信号を印加して奇数番目のデ
ータライン及びそれに隣接する偶数番目のデータライン
を短絡させ、データラインに充電された電荷を再活用す
ることを特徴とするTFT−LCD駆動方法。7. A method of driving a TFT-LCD driving circuit of a dot inversion type and a column inversion type, wherein a charge recycling control signal is applied during a horizontal blanking time or a vertical blanking time to form odd-numbered data. A TFT-LCD driving method, wherein a line and an even-numbered data line adjacent thereto are short-circuited, and charges stored in the data line are reused.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR12729/1997 | 1997-04-07 | ||
KR1019970012729A KR100234720B1 (en) | 1997-04-07 | 1997-04-07 | Driving circuit of tft-lcd |
Publications (2)
Publication Number | Publication Date |
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JPH10282940A true JPH10282940A (en) | 1998-10-23 |
JP2955851B2 JP2955851B2 (en) | 1999-10-04 |
Family
ID=19502097
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Application Number | Title | Priority Date | Filing Date |
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JP10094368A Expired - Lifetime JP2955851B2 (en) | 1997-04-07 | 1998-04-07 | TFT-LCD drive circuit |
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US (1) | US6064363A (en) |
JP (1) | JP2955851B2 (en) |
KR (1) | KR100234720B1 (en) |
DE (1) | DE19801318C2 (en) |
GB (1) | GB2324191B (en) |
TW (1) | TW350063B (en) |
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Also Published As
Publication number | Publication date |
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US6064363A (en) | 2000-05-16 |
GB9807255D0 (en) | 1998-06-03 |
KR100234720B1 (en) | 1999-12-15 |
GB2324191A (en) | 1998-10-14 |
JP2955851B2 (en) | 1999-10-04 |
GB2324191B (en) | 1999-08-11 |
DE19801318C2 (en) | 2001-10-31 |
KR19980076166A (en) | 1998-11-16 |
TW350063B (en) | 1999-01-11 |
DE19801318A1 (en) | 1998-10-15 |
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